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A pendulum question watch

1. From AQA unit 4, June 06.

The bob of a simple pendulum, of mass 1.2x10^-2 kg swings with an amplitude of 51mm. It takes 45.6s to complete 25 oscillations. Calculate

a) the length of the pendulum

b) the magnitude of the restoring force that acts on the bob when at it's maximum displacement.

I've got 0.860m for a, and 6.96x10^-3 N for b.

Am I right?
2. Why not use the mark schemes on the website?
http://web.aqa.org.uk/qual/gceasa/phya_assess.php
3. p.s. a) is correct.
4. The Length seems to be correct did you use L = g/(f^2 x 4 x pi^2) or another method ?
5. propane nightmares

6. (Original post by Jeester)
Why not use the mark schemes on the website?
http://web.aqa.org.uk/qual/gceasa/phya_assess.php
check your links before you post them. There isn't a markscheme for this paper.
7. (Original post by [email protected]@y)
The Length seems to be correct did you use L = g/(f^2 x 4 x pi^2) or another method ?
yeah I rearranged T=2pi.sqrt(l/g) to get the length.

For b, I've tried it again and got a different answer of 0.0291 N
8. (Original post by Jaziek)
check your links before you post them. There isn't a markscheme for this paper.
http://store.aqa.org.uk/qual/gceasa/...W-MS-JUN06.PDF

What the **** do you call that you ungratful little prick?

9. (Original post by Jeester)
http://store.aqa.org.uk/qual/gceasa/...W-MS-JUN06.PDF

WTF do you call that you ungratful little prick.
http://i951.photobucket.com/albums/a...nds/th_Yes.gif
woah, ok sorry. The link said it was the markscheme for section A, thats all. Yes, my mistake.

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